Adapter plate



FIG. 1 is a perspective view showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top end view thereof; and,

FIG. 7 is a bottom end view thereof. 

The ornamental design for an adapter plate, as shown and described. 